I will say this, that barrel is really tight! I mean there is no way your sending another fast ball down that barrel without swabbing first. So I was thinking that smaller ball might just be the ticket. Besides for what I paid for the mold, I have wasted a lot more then that on foolish things. So I will keep it. Kind of excited to cast some ball out of it and try them. Maybe some old cotton blue jean. Have to measure that.